Just finished realigning the A/C ducts on my '81. I was surprised to see that the whole duct assembly is held up by only 1 screw. I also replaced weatherstrip on the ducts hoping to provide better seal and more air into the passenger compartment. When I did all this I took the center dash out and I decided to replace all the lamps to the gauges. Foolishly I took them all out without realizing that some of receptacles for the bulbs are different colors. Is there a reason for them to be colored differently and does anyone have a guide for replacing. Any help would be appreciated.